thanks guys for your help.
my testing this morning informed me that i can not use 2 tranmitters at the same time on the same frequency.
Yes that’s correct....do i have the above understood corectly or am i way off.
Leave them unconnected. For each receiver use only one dedicated output to control the necessary relay.additionally, when looking at the schematics
1. For each of the D0 to D7 on the Decoder what must these pins be connected to if i do not hook them up to a relay drive circut. or do i just leave them on their own.
2. for pin A0 it can get hooked to ground or Vcc (depending on baud rate desired) while pins A1 to A7, are hooked to the ground (as shown). and based on my knowledge this becomes only 1 of 256 possible combinations for this fixed code. However, could each of the pins A1 to A7 also be hooked to the Vcc (b/c it says it needs all pins to be hooked to Vcc or ground) and if so, is this where they can be connected to a dip switch to provide for the various addresses and the address set for the transmitter must match the address set for the receiver or it will not work. if my logic is true, then this would result in the ability to select one of the 256 unique addresses. am i correct in my understanding.
If we search the internet we may find various examples of microcontroller based encoding/decoding circuits, some examples here:The sparkfun site is for you. Someone there probably already has code written to do what you want using standard available modules.
on the diagram for the transmitter above, there is a transmit enable pushbutton (green box). my understanding is that this is what transmitts the signal. so in my case, if i had a momentary pushbutton for D0 to D7 would i then have to press each of the buttons i wanted transmitted along with pressing the TE button.
In this situation that’s better to use some switches, not push buttons, each time the first step in this procedure to prepare the needed combination and second time to press the transmit button.if such is the case, how would i go about doing this so that i would not have to hold both the data button and TE button down at the same time but rather only have to press the data button (or would this not work).
Need to have data prepared before transmit button pressed.additionally, if by chance when i pressed data button 1 and 2 but not exactly at the same time but say 1/2 second apart, would both corresponding receivers 1+2 still decode this to know that buttons 1+2 were pressed. would it matter if the delay when pressing the buttons was more or less than the 1/2 second apart..
Yes.or does the above only work when you use a toggle switch being either on/off for each of the data buttons and then if they are on then you press the TE button.
I don’t have any details about off the shelf products to be used in a similar application. :roll:So now that i have most of this somewhat figured, do i have to build this all from scratch and test this on my own, or does a complete circuit board exist (i dont want to recreate the wheel if i do not have to), and if so where would be a good place to get it or track the materials down for what i need.
To avoid additional problems( between manual and automated control) we may insert to the GND on each section of the data switches some resistors. But as long there is no information about D0-D7 inputs current in the datasheet, we need to consider as the maximum resistor value must keep the low level voltage lower than V max= 0.2 Vcc = 1V, so in theory we can place 8* 1k ohms resistors to the GND, but in practice this theoretical value need to be tested. :-DAlso, on the transmitter diagram it shows D0 to D7 being hooked to SPDT switches (so it is either hooked to Ground or Vcc), for my application i have a computer controller that has the 8 relays (the relays are integrated into the circuit board and there are only 2 wires coming out from each relay) which would act as a SPST switch connecting the data (0-7) to the Vcc for each one. Therefore, how would i work this so that i could use this with the computer controller and SPST relay.
to complicate matters even further, i would like to use either the computer controller as well as manual control of the transmitter. my concern is that if the manual control pushbutton is a SPDT swithch that is not pressed has the D0 connected to Ground, and then when the computer controller trips relay/button 1 (hooked to D0) the it will complete the circuit for D0 and Vcc resulting in a short between Vcc and ground.
any ideas.
I assume this encoder and the decoder circuits has low power consumption from the 5V power supply, so you may use a simple LM7805 for each circuit.lastly, all of my machines are hooked to a 12v car battery and it appears that this encoder/decoder is on a 5v power source. i know i can get external 12to5 voltage converters or would it be better to just hook up 12v and put a LM7805 regulator on here (or will there be too much heat dissipation). using either of the methods will i have any issues if i have anywhere from 12-13.65 volts in the batteries.
you need to transmit to all 8 possibly at the same time. Since 8 transmitters at the same frequency will jam each other.
I'm under the impression that biff44 stated this very clearly, also explicitely for the case of two transmitters, see post #10.Hi, you mean to say that I cannot use two RF transmitters of the same frequency at the same time?
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